 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.search;

 import org.eclipse.core.runtime.*;
 import org.eclipse.update.core.*;
 import org.eclipse.update.internal.operations.*;

 /**
  * This class can be added to the update search request
  * to filter out features that are back-level (are
  * older or the same as the features already installed).
  *
  * <p>
  * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  * </p>
  * @see UpdateSearchRequest
  * @see IUpdateSearchFilter
  * @since 3.0
  */
 public class BackLevelFilter extends BaseFilter {
     
     public boolean accept(IFeature match) {
         
             PluginVersionIdentifier matchVid = match.getVersionedIdentifier().getVersion();
             IFeature [] installed = UpdateUtils.getInstalledFeatures(match.getVersionedIdentifier(), false);
             if (installed.length==0) return true;
             
             for (int i=0; i<installed.length; i++) {
                 PluginVersionIdentifier ivid = installed[i].getVersionedIdentifier().getVersion();
                 if (matchVid.isGreaterThan(ivid))
                     continue;
                 // installed version is the same or newer than
 // the match - filter out
 return false;
             }
             return true;
         
     }
     
     public boolean accept(IFeatureReference match) {
         try {
             PluginVersionIdentifier matchVid = match.getVersionedIdentifier().getVersion();
             IFeature [] installed = UpdateUtils.getInstalledFeatures(match.getVersionedIdentifier(), false);
             if (installed.length==0) return true;
             
             for (int i=0; i<installed.length; i++) {
                 PluginVersionIdentifier ivid = installed[i].getVersionedIdentifier().getVersion();
                 if (matchVid.isGreaterThan(ivid))
                     continue;
                 // installed version is the same or newer than
 // the match - filter out
 return false;
             }
             return true;
         } catch (CoreException e) {
             return false;
         }
     }
 }

